| Somersworth to Smolyan | 4,581.68 mi (7,373.50 km) |
| Somersworth to Sofia | 4,479.14 mi (7,208.48 km) |
| Somersworth to Sopot | 4,538.85 mi (7,304.58 km) |
| Somersworth to Sozopol | 4,667.04 mi (7,510.88 km) |
| Somersworth to Sredets | 4,650.01 mi (7,483.47 km) |
| Somersworth to Stamboliyski | 4,551.72 mi (7,325.29 km) |
| Somersworth to Stara Zagora | 4,584.30 mi (7,377.71 km) |
| Somersworth to Svilengrad | 4,634.89 mi (7,459.14 km) |
| Somersworth to Svishtov | 4,522.46 mi (7,278.20 km) |
| Somersworth to Targovishte | 4,586.94 mi (7,381.96 km) |
| Somersworth to Teteven | 4,508.19 mi (7,255.23 km) |
| Somersworth to Troyan | 4,527.75 mi (7,286.70 km) |
| Somersworth to Tryavna | 4,559.94 mi (7,338.52 km) |
| Somersworth to Tutrakan | 4,554.33 mi (7,329.49 km) |
| Somersworth to Varna | 4,641.03 mi (7,469.01 km) |
